Grader blade hoist



March 22, 1932. T. D, WORKMAN 1,850,782

GRADER BLADE HOI S T ffwy am ATTORN EY March 22, 1932. T. WORKMAN1,850,782

GRADER `BLADE HoIsT Filed April 7, l95l 2 Sheets-Sheet 2 INVENTORWITNESS/ Bymfd,

ATTORNEY Patented @Mainl 22, 1932.A

@siren erases;

THOMAS D. WORKMAN7 onlfsnivnsno; Kansns G12-Anna `isLAnn Horen.

Application sied Api-i1 7,1931; serial. Na; 52854282,

This invention relates tohoists for blades of road graders. A primaryobj vide a hoist for raisingand lowering: road grader blades and thelike which isv so constructed that the blade may be quickly raised orlowered with a inininiuinaniount of effort on thepart of the operator.

Another object is to provide a double actm ing hoist of this characterto facilitate the hoist; f

Fig. 2`is a top plan View thereof;V Fig. 3 is an enlargedvertiealsection ofthe hoist with parts beingbroken out for Convenienee inillustration;

Fig. l is aside elevationoi the upper portion of the hoist with partsbroken off i line 5-5 'of Fig. 3 with 4the upper portion of thegearhousing broken away to disclose the interior; and n Fig. 6 is atransverse'section taken on the line 6 6 of Fig. 3.

v The hoist 10 which constitutes this `inven- 3; tion is shown appliedto a'conventional road grader `which includes the usual supporting Yfront wheelsl and `Caterpillarv rear construction 2 ywith an archedframe 3 from the'front portion of'whichfextends rearwardly oiade bedescribed.v

A@ Vcross .bar` 6 is arranged 'transversely j f above Vthe frame 3 andsupports the hoist constituting vthis invention. i The lowerend tof K 4A 'rwilldrivesaid gear fandthus operate the r (l with the circle 7attached to the bladel; Itis 9' to he understood that .thereare twoothese the hoist is connected Vbyxa :universalfjoint ect of the inventionis to pro-L road grader equipped withfthis'improved e Fig. 5 is atransverse section taken` on the supporting bars t whiehldiverge towardtheir rear ends andare connected: with the scraping Y blade 5 which isdesigned tobe raised orlo'wl y v2S 'thereonfThiswheelfS-isffpositionedin the redby the hoist 1Q inamannerpresentlyto hoists. transversely spacedfroin eachother'as. i

shown in Fig; Zhy. means of' which. one. end ontlie otherfof' theablademay be. raised at# will! o-r theblade bodily/.raised iuiiifornily, byoperating bothflioists` hln; View. ofthe fact. Ythat they are exactlyalike oneonlywvill be deserihedgiirdetail. d

. Each hoist l'OLiiicludes a. worin gear casing. 11in which a. ywormgear2O isrevolublyy mounted; and protectedb'y said casingagainst.. theweather. Extendingfromtlieupper face ofthe cas1ng}11isal1ollow .pipe12the inner.,A face. of. which Aisinad'e angular Vto receive a.V

.Correspondiiiglyv shaped' angular pipe .13. vconf l kneoted by. auni'yersalljointyle with.. the ban 654;, 6. ,'I'liisangularconnection.of.`.thetwo pipes?-l l'land lfprovidesfortheirlongitudinaltele.- scopicVv movement. and yyet. prev-ents turning-r 1ofthe..-unit, of which {they} constitutefa part..

Extending s from the.. lower :wall of. the oas.- TG.;

ing,4 11`is another,y pipe 1b"l wliiclraligns with the .pipe 12 and isyiliade .circular iiieonlgu-` rationtoreceivethe correspondingly shapedpipe 16 conneetedibyr a universal oint; 17. with ithe.blade'*carryingx'ineinher 7l. The interior 175i;

of' the pipes '13.7 and. 1.6v are threadedt-oirev ceiv'e left and4`rightl handlthreaded shafts 18.'. andl'lfwhieh. are madefintegral'with. the. worni gear QOIand. rotate th'erewithi withoutcontactpligftlje pipes. 12 and 15...

A worn'rcarrying. Mhaftfl i's4 ournalledin the casing'llas shownclearlyin Fig..5. and'.

the Vworin ,nieshes 'withf the worin'. gear 20 so that when the shaft'Qlisrotated' theworni gear willb'efpdriveni .Q'ne end ofj the shaft Yet.211 projects lbeyondthe .casingllland is. congiff nested by a universal.j oint. 22 `with aufy angu-ff lar rod 23 telescoped intoacorrespondingly,1`

shaped pipeQZl' which is connectedlby a.univerSalfj'ointwithjarshaft.2.6 inountedinfSQt. 'y

a hearing :2T and" having anoperat'ing, wheel.'

cab of' thegraderfor convenient operation by theoperator. y 5 Y Itwillxthus be seen that whenthe wheel f 28 is rotated the yworin 21 willbe similarly turned and. meshing ywiththe worin gear 20 threaded shafts18 and 19 causing the pipes 13and16 to moveV inwardly in pipes 12 .and

15 and thus raise the blade 5. It is of course understood that turningof the wheel in the opposite direction will reverse the movement ofthese parts and lower the blade. Y

The ortion of the casing 11 in which the shag;I 21 is journalled has aremovable cap 11a to afford access to the interior of the cas in and topermit theparts to be assembled. t will thus be seen that this doubleacting worm gear will by a single turn ofthe Wheel 28 raise or lower theblade 5 twice the dis tance which could otherwise be done.

Without further description it is thought that the features andadvantages of the in` vention will be readily ap arent to. thosevvskilled in the art, and it wi l, ofcourse, understood that changesfinthe form, propor-V tion and minorfdetails of construction mayberesorted'to, Without departing from; thel spirit of the invention or itsscope as claimed.,

I claim:

1. A double acting hoist for gradery blades and the like comprising agear casingy having tubular members extending from opposite- `facesthereof in longitudinal alineinentny pipes telescopically engaged Withsaid: members and having universal joints at their ends. provided withconnectors for uniting said; ends to a support and the object to beraised and lowered, said tubes being internally threaded2 a worm gearmounted in said casing and having right andV left hand threaded; shaftsextending from its opposed faces and; threaded into said tubular pipes,`8 Worm* meshing withs'aid'gear, and mea-ns for ope. eratin saidworm forprojecting and retract--, ing said tubular members.

A2. A double acting hoist for grader blades and the like comprising agear casing having tubular members extending from opposite faces thereofin longitudinal alinement, pipes telescopically y engagedv with saidmembers and having universal joints at their'4 ends provided Withconnectors for uniting said ends toa su port and the object to be raisedandk lowere said tubes bein@r internally threaded', a Worm gear mountedin said casing and havin right and left hand threaded shafts exteningfrom its opposed faces and threaded into said tubular pipes, a wormmeshingk with said` gear, Lmeans yfor operating said n' worm forprojecting and retracting said tubular members, one of said tubularmembers and one of the' pipes carried by said casing y having slidingbut non-rotatable engagement; y

THOMAS D.WORKMAN. v

